The ending in a nut shell ...
So get this. After all the murder and mayhem, the mom and dad and daughter (who needs to eat a sandwich) all have a nice powwow happy smiley time on the front porch as grandpa is left to bleed in the living room. Grandpa finally joins them on the front porch for a hug. Nobody calls the police. Nobody checks on the bodies. Nobody calls an ambulance. They are just having a nice little time sitting around in a circle smiling and singing kumbaya.
Whoever wrote this, should never be allowed to write ANYTHING again. Not even a blog.